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Rectangular steel bar stair treads provide a higher energy and stiffness-to-pounds ratio and are available by using a serrated area when extra safety is required.Diproduksi oleh perakitan serangkaian batang logam sama spasi untuk menghubungkan anggota lintas, Grating AIS tersedia dalam tiga bahan populer; baja karbon ringan, 6000 aluminium seri,